While having a discussion, Technician A says that typically, engine knock occurs under load. Technician B says that carbon knock can occur even when not under load. Who is correct?

Question

Quizplus · Accepted Answer

Both technicians are correct. Engine knock, which is also known as detonation, usually occurs under load when there is high pressure and temperature in the combustion chamber. However, carbon knock can occur even when the engine is not under load due to the buildup of carbon deposits on the pistons and cylinder walls, causing pre-ignition.

While Having a Discussion, Technician a Says That Typically, Engine